Magnetic stopping device



June 2, 1953 l. S. ROBERTS MAGNETIC STOPPING DEVICE 2 Sheets-Sheet 1 Filed Dec. 30, 1949 JWM@ E ATTORNEY.

June 2, 1953 l. s. ROBERTS 2,640,310

MAGNETIC sToPPING DEVICE Filed Dec. so, 1949 2 Sheets-Sheet 2 JNVENTOR. /NGHM '5. ROBERTS TTOR/VE X Ithat it is unnecessarvto:lace-.thevstrand through Patented June 2, 1953 UNITED 2,640,310

YMGNETrofSToPPING DEVICE InghanfS,Robertseidley Park, Pa., assigner 'to viliinericanv .Viscose Corporation,I *Wilmington,v

'DeL-Q a corporation 'of'Delaware mtlieaticnineembr 3o, 1949;senaiiNilmsaia- This invention'relates toi-an ari'angexnent'ior interrupting thedelivery cfa strand-fby wmuitiple .twi'sttyp'e of 11p-twister when the stationary package holding begins to .rotate.

A conventional 11p-twister of :the multiple.twistv typeincludes adrivingmotonthe shaft owhich is hollow vand is extended to support-a yerfsecured thereto and krotatable therewith,` .and package holder that vis held stationary onthe shaft, such'as bygravitational or mag-neticsystems. The rotational .speeds vlof such a machine are normally in thea-ange of 6000 tof'lZ-,OOO revolutions per minute. -Machines Vof Ithis type are subject to occasional-faulty 'operationsuch as may result'rom bearing -seizureorltangling or snarlingof thexstr'and asit is drawn-from ythe package and which may cause the normally -stationary 'package holder to rotate. -It is` desirable to disconnect the twister from itslso'urce ofzpower when such faulty-'operation begins so'fas to .avoid l' possible damage to the twister-anelito adjacent machinery and possible vinjury tothe operator. In order to avoid vcollecting untwisted -ya-rnfit is also desirable that thev associated strandcollecting means be stopped when the twister is stopped or that the stra-nd loe-broken, 'In-.order to avoid power waste and excessive-yarntangling, it is furthermore desirable thatthetwisterjbe stopped whenever the-strand collecting Avmeans-is stopped for any reason.

It is an lobject of `the invention --to vprovide installed onexisting series operated twisting and f winding equipment without appreciable modification -thereoi`. It is still anothenobjectto catch the strand delivered by the nlptwister as it emerges `from the lower end of the spindleso therspindle whenirestarting the twister; @ther objeGtsTeatUreS-:andfadvantages*will :he apparent -from the following description of llthe 'invention andfthe drawing relating thereto in Lwhich twisterfand aswinder, illustratingone embodiment `of the `stopping mechanism; *Y n Fig. 2 :is afsection of the twister shown in Fig.

.l'taireny along lineaIIf-II Fig. is :a fragmentary-sectional yView oi the twister -Fshown in= Fig.- 1 and af-modified vthread- 'engagin'gde'vice attached-thereto; i

Fig: 4 I is a diagrammaticfsectionalyview of twister elements illustrated with relation to l another-modified thread-engaging; device;

yFig. -4a lis an enlarged top-view of the threadengaging device of Fig. 4; v y

Fig. 5 is a '-'view partly in 'section-Hof Vtwister elements and stillV another rnodiedstrand-engaging:v device;y andA i Y n i Fig. 6 IisY an elevation view; of ply-twisting 4apparatus andan emergency control :system therefor 'includinga wiring diaphragm.

The invention is r-st describedwith .reference to a two-ifor-onenpwwister rand-.a Aprf-:eision cone magnetically-.controlled dnechanisni for siinltaneouslv-terminatingthe Aapplicationof power Ato a `twister andava Winder. 'I-he Vmf'echariisrn com- `.prises,a lthread-loreairing. or catching. device `mounted `on the twister, responsive to .al .change .of magentic iorcetacting on. a .inagne'ticallyfsensi- -tive element thereof the package holder tion. vAdevioeffor openinga 'cir'ciiit energizes a driving motor. .for .the twisterV is' re- .Vsponsive directly tol'rnovenent .ofl the-:threadbrealing device or Lto .movement'of' a tensionsensitive device'foi-ldisengaging-the win'der from a Adriving- .rnen'iben rig. V1 'illustrates' apmtusinemamgawofor-one"..twister t which supports"a'siipplyp'ack- .agel while twisting a strandt-.which isfjpulled therefrom. and .passed `lto" a` Winder S to Ioe Y.col-

.spindle li. .Alpackag'e holder"l4"is.spporte'dlon .the -twister .spindle seattle 'by the bearings n ta'ched 'to r a base memberfi of vthe-holder .and extend from its lower surface into close clearance with the' upperlrsurtaceof :a-flyerw25-which is :secured fto--the-shaft 45; The vannuia'r Iportion o f fthe-1 ilyeizwhich mota-tesi at' clo'se clearance with theniaignetsL 21B-fand 2i comprisesra':non-magnetic yzfmateial 'falth'ough' the y'flyer :may llie lfabricated holder magnets for the element 39.

Yhas an upwardly-extending end portion 43 which, during periods of normal operation of the twister,

entirely therefrom. A pair of stationary magnets 28 and 29 are secured to and extend upwardly from a plate 30 comprising a non-magnetic material attached to the upper end of a driving motor 32 for the twister. The magnets 2S and 29 are spaced oppositely at equal radii from the axis of the twister; the magnets 20 and 2l are similarly 'spaced with respect to the axis. In their normal alignment, the magnets 20 and 2i are directly over the magnets 2Q and 28. Hovever, if the package holder is rotated, the magnets of the package holder are pulled outvof superimposition with the stationary magnets 2B and 29.

The package holder of the conventional twister is restrained from turning and for this reason may not be constructed with particular care as to its dynamic balance. A slight imbalance in the holder and/or a package supported thereon may result in destructive vibration if the holder tween the holder magnets and the stationary magnets. In apparatus, such as herein described, twisting and winding spindles are allowed to coast to a stop after operation of the mechanism of the invention, but the mechanism may also be used to electrically control deceleration devices not shown, such as solenoid-operated brakes.

The stopping mechanism for the winding system includes a device 34 mounted on a stationary portion oi the twister, suchas the plate 30, and

' comprising a base element` 35 secured to the plate 3% and having a biiurcate portion adapted to receive a pivot pin 3G. The pin 3S extends through a, swingable lever 33 which supports a magnetically-sensitive element 39. A set screw 4I extends in threaded relationship through the base member to support the lever 38 when it is not lifted upwardly by the attraction of the Lever 38 does not extend into the path of revolution of the thread 8 extending from an aperture in a lower portion of the spindle l to the frustoconical surface 155 of the flyer. When the holder is rotated out of its normal position, the lever l 38 is lifted upwardly by the attraction of one of the magnets or l2l for the element 39. The end portion 53 moves upwardly into the path of 4 the thread to engage the lower surface of the yer 25. carried against a lateral surface of the portion As the Vflyer rotates, the thread 8 is 43 (shown in Fig. 2) to be Wrapped about the spindle and ultimately broken as the flyer continues to turn and the Winder 9 continues to pull on the strand.

` The consequent drop in tension in the severed strand 8 passing to the Winder allows an arm 48 of the drop wire ldevice t9 to swing into ccntact with the serrated periphery of a cam 50.

' The arm 48 is lifted `lengthwise to carry upwardly a lever 52 to which the device `di! is pivotally secured which actuates a conventional drivedisengaging mechanism for the winding shaft 4 ported terminal 58 when the winding system is in operation, The terminals, however, separate when the normal tension in the line 8 as it passes between a tensioning device 60 and a traverse guide 6I is relieved; the motor 32 is no longer energized and subsequently coasts to a stop. The terminals 51 and 58 may be used in a circuit for operating a relay switch or other control means for the twister motor instead of being placed in the power circuit for the motor as shown. Such a circuit may also be used to control a solenoid-operated brake for the twister.

In Fig. 3 a modiiied thread-engaging mechanism is illustrated as being mounted on a twister such as shown in Fig. l. The mechanism comprises a lever 65 which may tilt with respect tc Va stationary support SS on a pivot pin 5l. A

magnet it of the holder lil acts during operasensitive element 13 secured to the lever 65 and prevents the up-turning portion 'l5 from engaging the thread which passes outwardly from the interior of the spindle shaft l5 to the outer surface 45 of the flyer. The magnet l is to be distinguished from the holding magnets 2B and 2l of Fig. l since it may not be used to prevent the holder from rotating but may be provided in addition to other elements for restraining the rotation oi the holder. The magnet lli remains supported over element 'i3 during normal operation of the winding system. However, when the package support is rotated to carry the magnet 10 out of its position above the element 13, thereby lessening the magnetic force pulling the element upward, the portion of the lever to which the element 'i3 is attached, drops downwardly by force of gravity and the tip l5 moves upwardly into the revolving path of the thread 8. The thread 8 is wrapped by the flyer around the portion 'l5 while subjected to a pull from a Winder such as that illustrated in Fig. l. The lever 55 is constructed so that in the absence of magnetic influences, the portion of the lever supporting the element i3 overbalances portions of the lever on the opposite side of the pivot. Tilting of the lever in the opposite direction such as when the element I3 'is attracted upwardly by a magnetic force is limited by an arm 86 of the stationary support which extends laterally under the lever 65. The arrangement for catching thread shown and described with respect to Fig. 3 may be substituted for the thread-catching device 34 of Fig. 1.

Figs. 4 and Lla illustrate a mcdied thread-arresting device which comprises a member B5 which is pivotably supported on a stationary member 86 at the pin 8?. The member may be tilted inwardly toward the yarn 3 into the position shown in ghost outline by the magnetic attraction of either of magnets el and 92 attached to a package holder 93, for a magnetically-sensitive element 89 attached to the member 85. The

element 89 may be provided with concave side surfaces as shown in Fig. 4a to catch and retain the yarn as the element moves into the path oi' revolution of the thread 8. The arrangement illustrated by Figs. 4 and 4a may be substituted for the thread-breaking device shown in Figs. l and 3.

Fig. 5 illustrates still another embodiment of the invention wherein the thread-catching device 34a is similar to that mounted on the twister shown in Fig. l and hereinbefore described, eX- cept for parts which have been added to open a circuit to a relay trip switch |04 which when ported .by the arm .38.a.

open, ,opens apower.. circuit ..(not' ishown`) forgenotiFig .5 which. aresimilar t0 portions of the .dev-ice.34 carrythesamenumeral withthe addition ..of tlieletter a A`.b'ase.memberf35u provides pivotably support, for a ,swingable arm.38a which yswings upwardly when Aa magnet2'0is rotated over a. magneticallyfsensitive element 39a1 'sup- When the arm 38a swings upwardly, the end portion' 43a extends into .the revolving .path ofthe ,yarn 8.y 'The yarnis caught bythetip while subjectedi'to apull by .a winding device .operated in .conjunction-withthe twister, and instantly .broken. The device"34a Yperforms an Vadditional Afunction not described hereinbefore with respect Vto another lembodiment, that of .opening a ,circuit such` as carried through lines I`I, |02 and |03 which are connected with a power Vsource to. energizeithe relay switch |04. 'Ihe circuit under operatingconditions of the winding system, extends" through an Vexteriorly and interiorly:threadedinsulating sleeve I05'extending through' the baseporti'on a', a set screw I 06'in threaded* relationship with the sleeve and a terminal' |01 securedtothe .arm 38a by a bolt |08. Lines 0| and I02are secured to the sleeve |05 and thebolt'IiIB respectively. Obviously, the circuit is broken'- when v'the `arm 38a .is lifted upwardly -by fa magnetic force applied ,to the element'39a. Other yarnbreaking devices accordingto4 this invention maybesimilarly provided with circuit-opening*terminals.

The strand-catching device according 'tothis invention is applicableto anytype of equipment for handlingthe strandrpassed along varevolving path. The device maybe'readily .mounted `on down-twisters as well as up-#twisters and itis readily adapted, for example, to a plyetwister.

is. one of .theimts tocause^one `ofthe. saidpaclrage holders or.. the` cageto start vrotating*with-it'srrespective spindle; Asth'e"spindle'speedsofrjthese units, particularlyithe. up-twisters, is-sui'ciently vhigh tor causev almost explosive""disintagration of portions of the.machineshould either "one'of the package'holdersor"the cage 'come'up'tosp'in- .die speed, thepresent invention'may be;applied to such a Iply-twisting 'system'rt'oz avoiddama'ge personnel.

Accordingly, the threadecatchingidevices "|32, I 33 and' I 34 'are' mounted on' a"fram'e"me1nber |36 just below the flyer of each unit. 'Each unit" is rpivotably supporting .a'lever IIll. Thejlever |'4I is, provided .with an .upwardlyextending portion |42 '..ncrmally positioned b'elowthe path 'df' the thread |44'as it passes vfrom an .aperture "|45 which connects with the bore of the hollow spindle shaft |46, .and an eye I41`of the Jfly'er Fig. 6 illustrates a machine for twisting cord comprising up-twisters |20 and Ii2'I anda doubling unit I22`of the down-#twistingtype for receiving strands |23 and |24 supplied by theuptwisters. The up-twisters l|20 .and "I2I are of'a general construction similar to that illustrated in theprevious figures. Basicparts'oithe downtwister '|22 comprise a vhollow spindle shaft |25, and a cage `|26for supporting ja reciprocating rthread guide |21 and a .takeup device such as the capstan rolls .|28 driven by the spindle'for'pulling the strands through theplytwisting system at a constant rate, saidcage being v rotatably .supported ,on the spindle and .prevented .'from turningby a magnetic system hereinafter described. Another principal part of the doubler is the package Aholder |29, also rotatably supported on the spindle independently of the cage |26. While the cage is restrained from turning, the 'holder |29 is rotated by a conventional torque-'transmitting .device of. whicha driving .member ispmounted .on the spindle .and ,mayslip or rotate wthrespectto .a driven vmember mounted fin the 'base ,of the .holder when. excessive torque .is applied by the driving member .to .the .driven member.

B37 proper adiustmentnoffhe torque-transmitngv |48. Secured .to the upper side of `the`lev`er I4I is a magnetically-sensitive element |50 which is spaced from the twister .axis .at'thesame radius as the magnet |35 of the package hl'der and the stationary magnet .`I31.v If for anyreason', the package `holder rotates to the extent that v'the magnet |35 is carried. over the magnetically-sensitive element |50, the lever `I4| iis tilted and the extension |42 is Vcarried intotherevolving `path of the vstrand |44. Tilting vof thelever may be limited by the engagementof a pair o'f'electric The terminals .I54`and .I55`function .to open and close an electricalcircuit,comprisinglines |50, I50a, and |5621 which -connect with power lines |66 and I61ftoenergizeiazsolenoid coil-'|51 of a relay switch designatedigenerally `as apparatus Within adotted line .I 58. Similar terminals of the thread-catching devices |33 and .I3`4Iare connected similarly into the same ,.circuit" in parallel .relationship so Vthatengagement of the terminals of .any one of .the-threadcatching devices will operatevth'e relay switch'.v

The solenoid vof .the `relay switch when energized iproduces .separation of. the .switch terminals |60 .and .ISI .of "a Vcircuit comprising Lli'n'es .|68 and 169, the motor |65, and the uline ii'fil. A movable .element 53.170 which' the ters nal ISU-'is secured 'is caught by thelatc'h Siwhen the terminals vare separated.. 'Electrical power is transmitted through the terminals to'a driving motor 'from the powerflines 160 and 10i. A re-set button |564 "mustbe pushed :to release the element I'163` to' againenergize' the `motor |65. While the 'motor is" illustrated' as a two phase type, any suitable .type of :motor may beuse'd to drive the y plv-twisting "system Vand a relay'switch controllingthe electrical power supplied thereto. While ythe motr'l05 :is shownas connected with separate belts' with eachot` 'the spindles, a separate motor may be used 'to'operate" eachvtwis'ting aww unit anda relay switch provided which will interrupt the transmission of power to such a plurality of motors simultaneously. When rapid deceleration of the ply-twisting system is required, electrically operated braking means may be provided on a common driving motor or at each of the spindles.` The braking means may be operated by a suitable relay switch having a solenoid coil which is energized by a circuit arrangement which includes the terminals of the strand-catching devices such as that shown. The strand-catching devices in Fig. 6 serve to prevent collection of improperly twisted strand into doubler |22.

A magnetically-operated mechanism used according to the invention to intercept a strand passing through a revolving path need not be used in a manner to break the strand but may instead be employed to wrap the strand around a portion of the machine on which the mechanism is mounted while rotating portions of the machine come to a stop. To obtain this result, the switch on an electrical control circuit for the driving motor is preferably actuated directly by motion of the strand-catching device, such as illustrated in Figs. and 6. So that the strand is not broken by a take-up device, such as the Winder of Fig. 1, the winding spindle is driven by a member which permits the shaft to stall when a predetermined tension is reached-in the strand short of its breaking strength, Means for producing a predetermined maximum torque, such as a slip-clutch or a torque motor of known design are satisfactory for this purpose. In an apparatus which wraps the strand instead of breaking it While rotating parts in which the strand-collecting device is mounted are decelerating, the movement of strand to the take-up device may actually be reversed momentarily and lresult in withdrawal to a small extent of strandy from a package being formed by the take-up means. An advantage of such a winding system is that the wrapped strand may be unhooked from the strand-catching device and the wraps of the unbroken strand pulled, for example, from around a twisterspindle without the necessity for relacing any portion of the system.

While preferred embodiments of the invention have been shown and described, it is to be understood that changes and variations may be made lwithout departing from the spirit and scope of the invention as dened in the appended claims.

I claim:

1. In a winding and twisting system, a machine having a hollow spindle for passing a continuous strand, a take-up means for moving the strand lengthwise of itself, an element attached to and extending radially from the spindle to rotate the strand in a revolving path as it moves toward the take-up means, a member for supporting a wound package, bearing means for rotatably mounting the member on the spindle, means for restraining the memberfrom rotating, and strand-catching mechanism comprising a lever which is movable into and out of the revolving path of the strand, said lever having magnetically-sensitive means associated therewith, magnetic means mounted on the member at a radius which permits rotation of the magnetic means to a position closely spaced with respect to the magnetically-sensitive means, said magnetic means having suiiicient attraction for the magnetically-sensitive means when rotated closely thereto to move the lever.

, 2. Ina Winding and twisting system, a machine having a hollow spindle for passing a continuous strand, a driving means for the machine, an electrical circuit for controllingl the drive means, a take-up means for moving the strand lengthwise of itself, an element extending radially from the spindle to rotate the strand in a revolving path as it moves toward the take-up means, a member, bearing means for mounting the member on the spindle, means for restraining the member from rotating, and strand-catching and switching mechanism comprising a lever which is moveable into and out of the revolving path of the strand, said lever having magneticallysensitive means associated therewith, magnetic means secured to the member at a radius which permits rotation of the magnetic means to a position closely spaced with respect to the magnetically-sensitive means, said magnetic means having suicient attraction for the magneticallysensitive means to move the lever toward said means when the member is rotated to bring the means into proximity to the magneticallysensitive means, and switch means associated with the lever for opening and closing the control circuit.

3. In a winding and twisting system, a twister, an electrical driving means for the twister, an electrical circuit for supplying power to the driving means, a Winder disposed to receive a strand from the twister, and driving means for the Winder; mechanism for stopping the transmission of power to the twister and the Winder; said twister having a hollow spindle, a package holder supported in relatively coaxial and rotatable relationship with the spindle, means for revolving about the holder a strand passing from the spindle in a direction lateral with respect to the linear direction of movement of the strand whereby the strand passes from the spindle in a revolving path, bearing means for mounting the holder on the spindle in coaxial and rotatable relationship, stationaiy magnetic holding elements spaced adjacently with respect to the holder, and magnetically-sensitive elements attached to the package holder and disposed for superimposition with said stationary elements in normal operating position to preventrotation of the holder; said Winder having a strand-tension-responsive device for disengaging the driving means for the Winder; vsaid mechanism for stopping the system comprising a movable magnetically-sensitive element positioned to be moved into said path of a strand when the package holder is rotated out of operating position; and means mounted on the Winder for opening the circuit, said circuit-opening means being responsive to movement of the drive-disengaging means of the Winder.

4. In a winding and twisting system, a twister, electrical means for driving the twister, an electrical circuit for energizing the driving means, a Winder disposed to receive strand from the twister, driving means for the Winder, and mechanism for stopping the transmission of power to the twister and the Winder; said twister ,having a hollow spindle, a stationary strandguide spaced endwise from the spindle, means attached to the spindle for revolving a. strand passing between the spindle and the guide laterally of itself, and a package holder supported in relatively coaxial and rotatable relationship with the spindle; Vsaid Winder having a strandtension-responsive device for disengaging the driving jmeans for the Winder; said mechanism forstopping. thewsystemrcomprising a magnetic element-meuhted'in'tiie"basejportion ofthegpaclel'- age holden-*amagneticallyisensitive reeiprocahl'e memberiporsitionedeto be-fmoved-nto and 'outofthe revolving path-of Va rstrand passing `from-- the spindle l`tothe guideL-said memberalso Lpositioned with-respectV to -a f circular path traversed-` by 'the magnetic element for movement in response-'to avariation in magnetic" -forceexerted -onA the member Yby the magnetic element v-asf'the holderismrotated, and-means for opening `the-circuit, said-circuit-opening '-mea-ns beingmounted --forengagement With:A the strand-` passing into "the winder--from-the twister 'andfbeing responsive `to variationinftension"ofl `the strand:

A strandecatching Yn'iechanis'm'for a twister havingra vhollow"spindle,n astati'onaryrstrand-` guide spaced'endwise from-the vspindle, means attached towthe spindle -'for f revolving laterally oitself a Vstrandpassing'between'the spindle andthe i guide; Vand' a package 'holder mounted inmcoaxial" and "rotatabley nrelationship with the spindle, means for restraining the holder from rotating, isaid'mechanismcomprising a magnetic elementl mounted 'in-"the holder, 'a reciprooable element-'positionedto be movedinto and out of` the Arevolving path4 of astrand passing between the 0spindle and the guide; said elementralso positionedtwithrespect 4to a path of the magnetic element"fo'r;`movement in response yto `a variation of "magnetic Aforce exerted `r*upon 'it ubyF 4t11e-rnag neticelement of fthe *holder when' the holder is rotated:

6. In'a windingrand'twisting system; aftwister; electrical means 'for-driving the twistenan elec"- tricarlv 'circuit"for-supplyingpoWerftdthe 'driving' means of'thef'twister, awinder, means for driv-` ing-thefwinde1, fandfmeans forfstopping the transmission *of* Ipower to the M twister "and lthe Winder, saidtwister -havinga fhollow spindle, a

stationaryrstrand-guide spaced endwisefroxn the spindle,vv means attached to "the rspindle for revolving'a strand passing between the spindle and the guide -laterallyjof"the-lengthwise direction of zthestrand; and -a package holder supported' in 'coaxial andv rotatable relationshipv -With f the spindle;said-'mechanism comprisinga magnetic element mounted Ain` the -hold er,` a magneticallysensitive reciprocable member-^positioned V'to o be movedinto and' out-of therevolvingipath-of the strandf'passing' from the f spindle `to the guide, said irnemb'er 'also positioned withl lrespect A-to va path of 'themagnetic element for movement inl response to ra 'variation in magnetic force 4exerted upon-r` it'by 'the "magnetic element uof theholder as the holder is^rotated,' and vmeans 'for Vopening the circuit Yconnected Withthe memberV and' ref sponsive :tofthe "movement thereof finto said *ref volving -str'and path."

'7; "Mechanisniw for "stopping'the "transmission of' power betweerra twister "andan'electrical drfvilng" meanstherefor; sai-d Utwister having a hollow spindle; a "stationary strand=guide 'spaced en'clWise from the spindle,V means attached Itothespindle :for revolving strandl passing Y'between theY spindle andthe guidey laterally:oiitself; yand ar package holder. supported in relatively'coaxialn and; rotatable relationshipl the spindle; said mechanism comprising a magnetic elementsup ported. .in the holder., and ,magnetically-fsensitive 4vreciprocable member positionedto. be ,moved intoA andeut, of., the .revolving path of (a strand passinggfromaaspindle..to theoguid, said'member also -positioned 'With';respect vto a A path traversed by` vthe, ,magnetic element for' movement inrgre-f spense to a variation n-fmagnetic force exerted by l thezmagnetcfelement onrfthefmember.faslthe holderfiisarotated,andrmeans:connectedwith the member for" -fopeningxthe circuit, ,Y sai-df'circuit-' opening. means? being4 respcnsivezto `'Irlovem'entnot the' memberv into:l saidirevolving .yarn paths 8.11111 aswindingrand;twistingisystem;la twister;- electrical: meansforfdriving. @the twister, fan/elec trical circuit for engergizingz-- thebdriving; means, avwinder, means-for drivingfthewi-nder, mechanism' for ,stopping thetransmissionfo powernto4 theftwister and. the twinder; ,saidftwisten having a :hollow spindle, a. yer yand *a package Y holder supported iin relatively-coaxifal and,ifotatableLre.i lationship saidfvvindery rvbeingff'disposed-to :receive a; :strand from: the A- twisternand havingl a :strand-i tension-responsive -devicenormally int :contact with? the strand :passing ffromazthe twister :to the Winder for disengagng the :driving L means :for the-1 Winder,` said-lmechanism -.comprising:a:,istationary fmagnetly fmountedl "in: closely-spacedllrelationship with, andifbelow,r said holderandiflyer; at least-ifone-:magnet attachedfto .fthefdownWandly-facing :surf ace of. the holder vandanormal-lvpoe sitionedlover *sthe stationary magnet, .alzzrecipr cable lever rp'ivota'bl'y 1 smeportedl` byfone portion thereof underneath the aflyer and having' an up-V wardly-projecting fp'ortion Which' is :sW-ingable.y in-V to= :and out. 'of the revolving; path oi=` "a -fstrand passing.-froml the spindle to'u a :peripheral sur-face of the yena rnagnetically-sens'itivefjelementv supported by fthevleverl at `afdistance fromfthe spindle vaxis ap.proxima.telyf\ equal'l 1to1-that ofi he stationaryfmagnetf but spaced-1 therefrom;l said element :having,sufficientr attractionc'for vthe;hold@ er1 magnet'fto-Inovetlie lleven towardv'thef'yen when ther-holden magnet is :approximately-1.over the felement, a" stationaryterminal-"for the-cincuit`v` mounted fon the Winder; `a movable terminal for f'th'etcirouit mountedon the fstrandltens'ion responsiveJ1 device of.,the1winder in 4engagement with the' f stationary terminal during operation but separable therefrom fbyfmovement offfsaidfdee vic'einaresponse tofairecluctiony in strandsltension;

9,' Infaiwin'ding andftwisting fsystem, fa :twisten electrica-ly means for vdrivingthe twiste1p an felee` trical circ-uit t'for :energizing the driving f means, a Winder, drivingxfm'eans for the;1 Winder?mecha-A nism for stopping the transmission of pov/erfto the :twister :and Y'the winden said` twister fh-aving a .hollowspindle aiflyer, :and ia-packagm holder supported rin, coaxialandg @rotatable relationship Withcthe rspindle, a.- doWnWardly-facing: surface onv said.v holder, and ymeansf for -f restrainingfthe rotation ofthe holder,y said; :Winder f disposedf to receive strand from. fthe: twister Y`andfhaving` a dropnvire: device 'for engaging 1a strandflpassing fromfzthe 'twister -to :the Winder and ffbeing: are'-A sponsive t'o strand. tension for;'controlling:aidrive dis'engagingv means; lo'f :the -winde'r,: saidfrnech-` anism for the :system f comprisingf afmagnetic rele.- ment @attached lto;` :tlmevv downwardlyefacingwsurface `of the iholdenwf-atiltable leversupportedine termediatelyffrof- -`lits `lfends y-on a `'stationary Apivot having a magnetically-sensitive 'l element secured to- *it -to yone side ofi the-pivot "at substantially the same radius VfromV the-spindle-axisias" the magnetic Aelementy offithe holder-=andftheelever having u an upwardly yextendirig portion-on `the side Vof the pvot oppositesaid sensitive ele; ment'which. is'swingable intdthe"pathgofafstrand passing frorncthe 'spindle to `thediver.;periphery but is-f normally" positioned Vbelow saidlpath" v by tiltingl fof, -`they lever4V :causedkby-the magnetic: ath' traction-ofthe holder element or -the`-magneti= ycally-sensitive element, a stationary terminal for the circuit supported in the Winder, and a movable terminal supported on the drop-wire device and held in engagement with the 'stationary terminal when the dropwire device is in operating .position by engagement of the strand therewith as the strand passes from the twister to the take-up means of the Winder.

10. In a winding and twisting system, a twister, electrical means for driving the twister, an electrical circuit for energizing the driving means, a Winder, driving means for the Winder, mechanism for stopping 'the transmission of power to the twister and the Winder, 'said twister having a hollow spindle, a flyer, a stationary strandguide spaced endwise from the spindle, a package holder supported in coaxial and rotatable relationship with the spindle and means for restraining the rotation of the holder, said Winder having a drop-Wire device for engaging a strand passing from the twister to the Winder and being responsive to strand tension for controlling a drive-disengaging means of the Winder, said mechanism comprising a magnetic element attached to the base of the holder near a peripheral portion of the yer, a lever pivotably supported on a fixed axis and having a portion extending into a region located upwardly and radially outwardly of the surface of the flyer from Which the strand passes from the flyer to the guide to form a balloon about the holder, a magnetically-sensitive strand-engaging member .attached to the said portion of the lever, means for urging the Isaid portion of the lever and member to a position which is radially outwardly of the strand path, said means exerting a force which is less than that exerted on the strandengaging member :by the magnetic element of the holder when the element is rotated -into close proximity with the member, a stationary terminal of the circuit supported in the Winder, and a movable terminal 4of the circuit supported on the -drop-wire device and held in engagement with the stationary terminal when the drop-Wire device is in operating position by engagement of the strand therewith as the strand passes from the twister to the take-up means of the Winder.

1l. In a Winding and twisting system, a twister, a Winder, electrical means for driving the twister, an electrical circuit for energizing the driving means, an electrical means for stopping the system, said twister having a hollow spindle, a flyer, a package holder supported in coaxial and rotatable relationship with the spindle and means for restraining the rotation of the holder, said Winder having a drop-wire device for engaging a strand passing from the twister to the Winder and being responsive to strand tension for controlling a drive-diseng-aging means for the Winder, said stopping mechanism comprising a magnetic element attached to the base of the holder near a peripheral portion of the flyer, a lever pivotably supported on a ixed axis and having a portion extending into la region located upwardly and radially outwardly from the surface of the yer along which the strand leaves the yer to form a balloon, a magnetically-sensitive member attached to said portion of the lever, an extension of said portion for engaging the strand, said lever being weighted to normally assume a position in which the extension is positioned radially outwardly from the 'strand path, a Istationary terminal vof the circuit supported in the Winder, and a movable terminal of the circuit supported on the dropwire device and held in engagement'with the stationary terminal when the drop-wire 4devi-ce is in its normal operating position resulting from engagement of the strand therewith as the strand passes from the twister to the take-up means of the Winder.

12. In a winding and twisting system, a twister, a Winder, electrical means for driving thetwister, an electrical circuit for energizing the driving means,` a mechanism for stopping the system; said twister having a hollow spindle, a flyer, a package holder, a downwardly-facing surface on said holder, bearing means for mounting the holder on the spindle in rotatable and coaxial relationship therewith, and means for restraining the rotation of the holder; said Winder having a drop-wire device for engaging a strand passing from the twister to the Winder and being responsive to strand tension for controlling a drive-disengaging means of the Winder; said stopping mechanism for the system comprising a stationary magnet mounted in closely-spaced relationship with, and below, said holder and flyer, at least one magnet attached to the downwardly-facing surface of the holder normally positioned over the stationary magnet, a reciprocable lever pivotably supported underneath the yer and having an upwardly-extending strand-engaging portion which is 'swingable into and out of the revolving path of a strand passing from the spindle to a peripheral `surface of the yer, a magnetically-sensitivey element supported on the lever between the pivot and the strand-engaging `portion at a distance from the spindle axis approximately equal to that of the stationary magnet but spaced from the magnet, said element having suflicient -attraction for the holder magnet to move the lever toward the holder when the holder is rotated to carry the magnet over the element, an electricallyoper-ated switch for the circuit which energizes the means for driving the twister, a second circuit for energizing the switch to open the iirstnamed circuit, and a pair of terminals in the second circuit, one of which is stationary and the other is mounted on the lever to engage the stationary terminal when the lever is in its normal position out of engagement with the strand.

13. In a winding and twisting system, a takeup device, a strand-supplying device, at least one of said devices being a twister comprising a hollow spindle, an element attached to and extending radially from the spindle to rotate the strand in a revolving path as it moves lengthwise of itself, a member, bearing means for rotatably mounting the member on the spindle, means for restraining the member from rotating, and strand-catching mechanism comprising a lever which is supported for movement into and out of the revolving path of the strand, a magnetically-sensitive element mounted on the lever, magnetic means mounted on the member at a radius which permits rotation of the magnetic means'to a position closely spaced with respect to the magnetically-sensitive element, said magnetic means having suiiicient attraction for the magneticallysensitive element when rotated closely thereto to move the lever.

14. In a winding and twisting system, a strandsupplying means, a multiple twist type of take-up twister comprising a hollow spindle, an element attached to and extending radially from the spindle to rotate the strand in a revolving path as it moves lengthwise of itself, a member, bear- 13 ing means for rotatably mounting the member on the spindle, means for restraining the member from rotating, and strand-catching mechanism comprising a lever which is supported for movement into and out of the revolving path of the strand, a magnetically-sensitive element mounted on the lever, magnetic means mounted on the member at a radius which permits rotation of the magnetic means to a position closely spaced with respect to the magnetically-sensitive element, said magnetic means having sufficient attraction for the magnetically-sensitive element when rotated closely thereto to move the lever.

15. In a winding and twisting system, at least one strand-supplying twister, a, multiple twist type of take-up twister comprising a hollow spindle, an element attached to and extending radially from the spindle to rotate the strand in a revolving path as it moves lengthwise of itself, a, member, bearing means for rotatably mounting the member on the spindle, means for restraining the member from rotating, and strand-catching mechanism comprising a lever which is supported for movement into and out of the revolving path of the strand, a magnetically-sensitive element mounted on the lever, magnetic means mounted on the member at a radius which .permits rotation of the magnetic means to a position closely spaced with respect to the magnetically-sentitive element, said magnetic means having sufcient attraction for the magnetically sensitive element when rotated closely thereto to move the lever.

16. In a winding and twisting system, two strand-supplying twisters, a multiple twist type of take-up twister comprising a hollow spindle, an element attached to and extending radially from the spindle to rotate the strand in a revolving ypath as it moves lengthwise of itself, a member, bearing means for rotatably mounting the member on the spindle, means for restraining the member from rotating, and strand-catching mechanism comprising a, lever which is supported for movement into and out of the revolving path of the strand, a, magnetically-sensitive element mounted on the lever, magnetic means mounted on the member at a radius which permits rotation of the magnetic means to a position closely spaced with respect to the magnetically-sensitive element, said magnetic means having suilcient attraction for the magneticallysensitive element when rotated closely thereto to move the lever.

17. In a winding and twisting systenna machine having a hollow spindle for passing a continuous strand, a ilier attached to and extending radially from the spindle to rotate the strand in a revolving path about the spindle, a support for a wound package, bearing means for rotatably mounting the support on the spindle, means for restraining the support from rotating, a strandcatching mechanism comprising a member movable into and out of the revolving path of the strand, said member comprising an element of magnetic material, and another element of magneticmaterial being mounted on the support in such spaced relationship with respect to the spindle axis as to be rotatable to a position closely-spaced with respect to the element of the member, at least one of said elements being magnetized and having sufcient attraction for another of said elements in rotatable relationship therewith to move the member into the .path of the strand.

18. In a winding and twisting system, a machine having a hollow spindle for passing a continuous strand, a flier attached to and extending radially from the spindle to rotate the strand in a revolving path about the spindle, a support for a wound package, bearing means for rotatably mounting the support on the spindle, means for restraining the support from rotating, a strandcatching mechanism comprising a member movable into and out of the revolving path of the strand, an element of magnetic material mounted on the member, and another element of magnetic material mounted on the support in such spaced relationship with respect to the spindle axis as to be rotatable to a position closely-spaced with respect to the element of the member, at least one of said elements having sufficient attraction for another of said elements in rotatable relationship therewith to move the member into the path of the strand.

INGHAM S. ROBERTS.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,907,551 Kraft May 9, 1933 2,053,645 Weaver Sept. 8, 1936 2,148,665 Wolfe Feb. 28, 1939 2,364,808 Nelson Dec. 12, 1944 2,400,323 Winslow May 14, 1948 2,410,674 Nelson Nov. 5, 1946 2,482,654 Cochran et al Sept. 20, 1949 2,487,837 Uhlig Nov. 15, 1949 

